Plot circle through 3 points

How can i plot a circle through 3 points?

the points are:

          X     Y      Z
point 1: 80,2  314,5  2,5 
point 2: 86,7  303,3  2,4 
point 3: 73,7  303,3  2,4

Thank you

Answer 1

[Joseph Cheng]

You'll find the center point of the circle by finding the intersection of two lines.

Start off by calculating the line equation for two lines pairs say points 1 to 2 and 2 to 3. then the center point is the intersections of the perpendicular bisection of these two lines.

a quick online search has diagrams here http://www.mathopenref.com/const3pointcircle.html